i had the dir-655 with desktops and laptops running with xp and win 7, also some other devices such as ipod, iphone, ps3, xbox, problem occura with conflict of network ip address, i think xp and win 7 both login with the same network ip address. So I start to disconnect every device and try to connect each desktop and laptops, one by one, enabled the DHCP and reserve the network ip to avoid conflict. But here's the problem, when I connect the first computer with wired to the dir-655, can't find the computer in the DHCP list so I cannot do the reserve, I'm able to surf internet even I can see info with ipconfig. So I connected 1 wired and 2 wifi to the network, only 1 wifi network ip showing on the list, so I reserve that one, but after I refresh, the DHCP list is empty. Anyone with the same problem? any solution? Thank you.